Pollux vertical 2-player simultaneous scrolling shooter, produced by Dooyang / Atlus in 1991.
Requires 1 8-way joystick, and 2-buttons per player.
Has a standard Jamma pinout.
Review the photo gallery, you will see that the +5vdc input shows some heat damage on the parts side.
This looks like an original factory PCB, but not 100% sure.
The PCB is dirty, as pictured.
All that is offered here is the PCB, other items pictured are not included.